Combined type air heater with denitration function

The utility model discloses a combined type air heater with denitration function belongs to the petrochemical technology field. This pre -heater adopts the cast iron board of three kinds of differentair side fin closenesses to arrange the heat exchange coefficient of the cold and hot gaseous both sides of control to it realizes the heat transfer mesh between air and flue gas to reach control walltemperature, low temperature section in that the sour dew of cast iron board fin out -of -control forms uses glass pipe pre -heater to carry out the heat transfer, the surface of the flue gas side that the cast iron board was arranged is equipped with the denitration catalyst, and the ammonia pipeline spouts the ammonia and the flue gas mixes through spouting in the flue, and oxynitrides and ammonia among the mixing flue gas produce reaction, contamination free nitrogen gas of generating pair atmosphere and water under the effect of catalyst. Oxynitrides in this pre -heater ability desorptionflue gas to utilize the co